Wave record analyzer



April 25, 1939. F. RIEBER- WAVE RECORD ANALYZER Filed Jan. 31, 1958 10 Sheets-Sheet l INVENTOR, FRANK 15559.

ATTORNEYS.

7 April 25, 1939. F. RIEBER WAVE RECORD ANALYZER Filed Jan. 31, 1938 10 Sheets-Sheet 2 Ills IN VEN TOR,

FRA NK RIEBER.

ATTORNEYS.

April 25, 1939. R F] BER 2,155,507

WAVE RECORD ANALYZER Filed Jan. 31, 1938 l0 Sheets- Sheet 3 IINVENTORT April 25, 1939. RIEBER 7 2,155,507

WAVE RECORD ANALYZER Filed Jan. 51, 1938 l0 Sheets-Sheet 4 E2911. 1 5 5 .I45 0 0E000??? f NVENTOR? ATTORNEYS.

April 25, 1939. F. RIEBER WAVE RECORD ANALYZER Filed Jan. 31, 1938 10 Sheets-Sheet 5 uuuuuu INVENTOR,

ATTORNEY April 25, 1939. F. RIEBER WAVE RECORD ANALYZER Filed Jan. 31, 1938 10 Sheets-Sheet 6 I INVEN TOR, FRANK R/EBER A TTORNEYS.

ApriE 25, 1939. F. RIEBER WAVE RECORD ANALYZER Filed Jan. 51, 1938 10 Sheets-Sheet 7 INVENTOR,

- FRANK R/EBER. WQr/ZM A TTORNEYS.

min

April 25, 1939. RIEBER 2,155,507

WAVE RECORD ANALYZER Filed Jan. 31, 1958 10 Sheets-Sheet 8 IN VEN TOR, FRANK R/EBER.

A TTORNEYS.

April 25, 1939. F. RIEBER 2,155,507

WAVE RECORD ANALYZER Filed Jan. '31, 1938 10 Sheets-Sheet 9 INVENTOR,

' FRANK R/EBER.

A TTORNEY .April 25, 1939. F. RIEBER 2,155,507

.WAVE RECORD ANALYZER Filed Jan. 31, 1938 10 Sheets-Sheet 1o Ana . FRANK R/EBER. BYW

Patented Apr. 25, 1939 UNITED STATES" PATENT OFFICE WAVE RECORD ANALYZER Frank Richer, Los Angeles, Calif., assignor of one-half to Continental Oil Company This invention relates to apparatus and methods for analyzing complex waves, and particularly to a form of analyzer which is especially adapted for use in connection with the methods 5 described in my prior applications Serial Nos. 746,861 and 758,834 (Patent No. 2,051,153), filed October 3, 1934, and December 18, 1934, respectively.

The prior applications referred to describe a method of analyzing complex waves, and particularly seismic waves for use in geophysical mapping of geological structures. In the method referred to, the waves are usually (although not necessarily) initiated by an explosion. The primary waves resulting from such an explosion is propagated through the'earth and is in part reflected, refracted and diffracted by the various changes in structure which it encounters, and portions of the reflected and diffracted wave :0 fronts return to the earth's surface. The return portions of the wave are picked up at a-general position spaced in known distance and direction from the point of explosion by a plurality of microphones or "geophones carefully spaced :5 along a known base line orbase lines, and are recorded phonographically as a plurality of parallel sound tracks on the same recording medium. In the case of the particular embodiment of the invention here-described, this medium is a length of motion picture film which carries ten sound tracks which are simultaneously recorded side by side. Additional tracks are also provided, first, to show the instant at which the explosion occurred with relation to its time of arrival at the geophone and, second, a timer trace which is preferably merely a 1,000 cycle wave which is impressed continuously on the record from start to finish of each recording.

The record thus formed is analyzed by phonographically reproducing the record just described with the outputs of each of the plurality of record traces or sound tracks mixed in a single channel. This channel is connected to a recording galvanometer. through suitable anfplifiers and filters, which makes a trace of the ordinary oscillograph variety, this trace representing the composite output of all of the geophones. In general, each of these geophones will have been at a different distance from the source of the impulse, as measured along its path, and hence the wave fronts will have reached each of them at a slightly different time. If the velocity of the wave in the earth is known, the difference in distance traveled by the wave in reaching each phone can be computed from the difference in time of arrival, and from this can be deduced the direction from which the wave arrived and hence the position of the structure from which it was reflected.

The method utilized to analyze the incoming waves and make the deductions referred to is to make repeated traces of the combined output of the geophones as recorded on the sound tracks.

displacing the points of take-off on the respective tracks by known amounts after each successive trace. If proper precautionsbe taken, a position can then be found where each of the takeoff points is displaced by an amount which is equivalent to the distance the recording film has traveled in the difference of time which the wave required to travel to the various geophones. At the distances used in practice the curvature of the wave-fronts is negligibly small, and hence the reproducing slits or take-off points will lie in a straight line which is perpendicular to the motion of the film if the wave happened to reach all of the phones simultaneously, and is at some oblique angle to the direction ,of motion under other conditions. When the displacement of the take-off points is accurately made, the same wave, as received on the different geophones, will be fed into the recorder in the same phase, and each of the sound tracks will reinforce each of the others as far as that particular wave train is concerned, giving a maximum amplitude of swing to the re-'- cording galvanometer. For any other position of the take-off points, the reinforcement will be less or there will be a partial or complete cancellation, as between the various sound tracks. Since the same initial wave will frequently be reflected or diffracted by many different strata, the position of the take-off pointsat which maximum reinforcement occurs will be different for different reflections, and if a sufiicient number of retracings of the record is made it will be found that maxima of different wave trains will be found on different traces; that data as to many different strata can be determined from the same record, and that extremely complicated structures may be plotted from recordings of a relatively few explosions.

Among the precautions to be taken in making and analyzing records of the'type referred to are, first, the accurate spacing of the geophones along a selected base line and, second, the elimination of errors which might arise through the fact that the weathering of the surface layer is ordinarily not uniform and that therefore there will be a constant error in the positioning of the take-off points if this non-uniform weathering be not compensated for. A complete analysis of the record furthermore requires the accurate comparison of a large number of retractings of the record and a third precaution is to insure that each trace is made in its proper relative position to the others.

With the above in view, the objects of this invention include: the provision of apparatus in which the movement of the original phonographic record and the medium upon which the traces of the combined sound tracks is produced are exactly correlated; the provision of apparatus wherein the take-off points on the sound tracks may be successively displaced by predetermined increments in making successive retracings; the provision of means for making individual corrections on each take-off point to compensate for non-uniform weathering; the provision of an apparatus wherein the displacement of the take-oi! points or reproducing slits does not affect the frequency response of the equipment as a. whole;

and, in general, the provision of an apparatus wherein the making of the large number of traces required for the satisfactory analysis of these waves is facilitated and made as nearly as possible automatic.

Other objects and advantages of this invention will appear in the specification and claims to follow, but I do not wish to be limited to the exact form of the equipment as shown except as limited by the claims.

Broadly considered this invention involves the combination of a mechanically driven carrier on which the various traces are made, this carrier being preferably in the form of a drum which is supplied with means for holding a band of paper around its periphery. Mechanically interlinked with the carrier referred to are means for driving a phonographic record in a fixed relationship thereto. Since the record is preferably a length of motion picture film carrying a plurality of sound tracks, there is provided a take-oi! or reproducing head comprising a separate reproducing slit or aperture for each of the sound tracks. Means are provided whereby at each revolution of the drum the successive apertures are dis-' placed by predetermined increments with respect to each other so as to alter the point at which the take-01f from the film occurs, and there is further provided an individual adjustment for each of the apertures which remains constant, irrespective of the displacement above referred to for making the weathering compensation. An exciter lamp is provided with an accompanying optical system such that all of the apertures are illuminated uniformly irrespective of their displacement, and the light passing through the apertures falls upon a common photocell. The photocell feeds into the usual amplifier, whose output is fed into a recording galvanometer having a pen or other recording point positioned to make a peripheral trace upon the paper carried by the drum. The apparatus is so arranged that upon each successive revolution of the drum 9. separate trace is formed, means being provided automatically todisplace the apertures and to advance the pen axially of the drum between successive revolutions thereof.

Referring to the drawings, Fig. 1 is a front elevation of the complete equipment, the word front as used herein always signifying the end of the device from which it is operated.

Fig. 2 is a side elevation of.the analyzer, as viewed from the right.

Fig. 3 is a rear elevation of the device.

Fig. 4 is a plan view of the analyzer.

Fig. 5 is a vertical section through the recording drum and its supports, showing a portion of til: interlock between the drum and the film Fig. 6 is a detailed view of a portion of this interlock, the plane of view being indicated by the dot and dash line 6-4 of Fig. 5.

Fig. 7 is a vertical sectional view through the film drive housing showing a. portion of the mechanism used for returning the film to its original position after each successive trace, the plane of section being parallel to the front of the appara- Fig. 8 is a vertical section parallel to the axis of the recording drum, as indicated by the dot and dash lines and arrows 8-8 in Fig. '7.

Fig. 9 is a fragmentary sectional view taken in a horizontal plane as indicated by the lines and arrows marked in Fig. 7.

Fig. 10 is a view showing the front of the film drive housing and the recording gate through which the sound tracks are reproduced, the plane of view being parallel and in front of the plane of Fig. 7.

Fig. 11 is a top view of the reproducing head. a portion of the top being cut away to show some of the detail within.

Fig. 12 is a rear view of the same head.

Fig. 13 is a horizontal sectional view through the reproducer head. the plane of section being indicated by the dot and dash lines l3-i3 of Fig. 12.

Fig. 14 is a vertical section whose plane is indicated by the dot and dash lines Il-ll on Fig. 11.

Fig. 15 is a horizontal section through the reproducing head, the plane being immediately below the top of the housing as indicated by the line li--l in Fig. 14.

Fig. 16 is another transverse section whose plane is indicated by the line li-IS of Fig. 14.

Fig. 17 is a partial vertical section whose plane is indicated by the line ||-'-il in Fig. 16.

Figs. 18 and I9 are oppositely directed partial sectional views each being taken from the plane of section indicated by the dot and dash line in Fig. 14 and the aspects being in the direction of the arrows marked by the respective figure numhere.

Fig. 20 is a view partly in elevation and partly in section showing the galvanometer and pen carriage and certain details of its drive.

Fig. 21 is a fragmentary view partly in section and partly in elevation showing the motor drive for advancing the pen carriage.

Fig. 22 is a schematic diagram of the electrical connections of the analyzing system.

Fig. 23 is a showing, partly schematic, of the pen carriage drive.

Fig. 24 is a fragmentary sectional view showing a mechanical interlink between the pen carriage and drum drives.

Considering in detail the embodiment of my invention chosen for specific illustration in this specification, it comprises a frame consisting of a base I and front and rear upright members 2 and 3, respectively, which carry the recording drum of the other mechanisms referred to. These aisaso'r which is mounted a drive motor 8 and certain other equipment as will later appear.

The drive motor shaft is provided with a ventilating fan i and drives a worm reduction gear 8 through a universal Joint 9.

Extending verticallyfrom the reduction gear is a slow speed shaft it which is divided by a pin or jaw clutch i2 and which drives a second reduction gear 83, this latter reduction gear also being of the worm type. The horizontal shaft of the gear i3 carries a ratchet wheel is and a drum drive wheel i5 which is freely pivoted on the shaft and is driven by a pawl it which engages the ratchet wheel, so that the drive wheel may be advanced in its normal direction of motion without the necessity of operating various reduction gears or the motor.

The recording drum itself is rotatable, not

\ upon a shaft but upon rollers mounted on the whereon the rollers engage.

front and rear frames respectively. These rollers engage annular drum frames is and I9 respectively, the inner surfaces of these drum frames being surfaced to form smooth bearing surfaces The first of these rollers is the drive wheel l5, which is provided with a rubber tire 20, forming a driving contact having a high coefficient of friction. The draw-Y ings show but one of the other rollers at the front end of the device, this roller 21 being mounted on a bell crank 28 and urged into contact with the drive surface by spring 29. The other roller is similarly mounted on the sideof the device toward the observer in Fig. 5. The

three rear rollers merely act as guides and supports, the upper roller 30 at the rear being mounted on a strut 32 which extends upward from the bridge 6 and the lower rollers 33' being mounted on adjustable brackets 34, fixed to the rear end frame 3.

Connecting the two drum frames l8 and i9 is the sheet metal drum 35 itself which forms the surface upon which the record strip is 1 stretched and held by a suitable clamp 31. The

gear is fixed to a vertical shaft 44 which is preferably provided with universal joints and extends upwardly from the drive in the base of the front frame 2 into the film drive housing 45.

The mechanism within this housing is best shown in Figs. 7 to 10 inclusive. Mounted on the upper extension 41 of the shaft 64 is a bevel gear t8 which engages a second gear 69 mounted on a horizontal shaft 50. At one end of the shaft is .a spur pinion 52 which meshes with a gear 53 driving a film-sprocket 56. Connected to. the

, other end of the shaft is a helical spring encased in a tubular guard 51.

It will be seen that as the drum revolves, driven by the drive wheel 45 it will actuate the vertical shaft 64 to drive the sprocket 54 and at the same time wind up the spring 55. At the end of each revolution of the drum, however, when the spring gear 62 encounters the mutilated section of the ring gear 39 the spring 55 will unwind, thereby reversing the motion of the sprocket and returning the him to its original position. The film used is in relatively short lengths. It is not mounted on spools, but is enclosedin casings 58 and 50, as shown in Figs. 1 and 2,-wherein it is permitted to coil itself freely. Repeated tests have shown that no tarigling or Jamming of the film occurs and there is therefore no necessity for the provision of complicated take-ups, the main drive sprocket being the only film moving element required.

Hinged to the frame. immediately in front of the fllm drive housing is the reproducing head, and means are provided for causing the motion of the film to actuateniechanism within this headwhich will shift the relative positions of the reproducing apertures mounted therein by a fixed relative amount after each rotation of the that they are alined across the film atan angle which changes by a predetermined amount between each successive pair of traces.

Mounted on the vertical shaft extension 1 is a-worm OI driving a worm wheel 82 which is mounted on a stub shaft jand fixed with a small spur pinion 63. Pinion 63 meshes the gear 64,

drum, 1. e., to move the apertures in echelon so and this gear drives a crank 65 engaging a'lever' $1. The interrelation of the crank 65 and lever 51 may best be seen inl ig. 9. The crank 55 travels counterclockwise durinig'the time that the film is being positively -driven by the motion of the-drum, and engages the tip of the lever 81 and raises it at the end of this portion of the cycle of operation. drive pinion 42 encounters the mutilated portion of the gear 38 im-# mediately thereafter, the spring 55 unwinds, and

. brings the him back to its original position. A

positive shock absorbing stop to this return motion is provided through a pin 69 on the gear 54 which hits a vertical pivoted lever 10, the chock of the impact being taken on a spring I2.

The motion of the lever 81 is transmitted through the front of the housing 45 by a pin 13. carried by the lever arm, this pin extending through the slot 14 in the front of the housing and engaging a collar 15 which is slidably mounted on a vertical shaft or'pin 75. The collar 15 carries a compression. spring 11, upon the upper end of which is mounteda second sliding collar is. Upward movement of the second collar is limited by a stop shoulder 19, and the-position of the latter canbe adjusted by rotating the shaft 15 by means of the knurled head 80, the lower end of the shaft being threaded into 9. lug

'82 carried by the housing.

The reproducing head 83 is hinged upon this same vertical shaft 15 and a lever 96 is pivotally mounted on the rear wall of the housing in such position that a pin dfifon the end thereof will engage a groove in the collar 18. Hence when the lever 51 within the film drive housing is raised its motion will be transmitted through the cellar l5, spring i1, and collar I8 to the lever 84. The motion thus transmitted is limited by the adjustment of the stop i9, and since the reproducing head is hinged on thepin 18, the. interrelation of the parts is not aflectedby swinging the head train.

Fig. 11 best shows connections between the lever 84 and the shaft 95. This shaft is also shown in Fig. 18, which latter figure also indicates a downwardly extending lever 99, mounted on the same shaft. and carrying at its end an adjustable link I00. Motion transmitted from the filmdrive housing is therefore communicated through this linkage to a crank I02 which carries a pawl I03 engaging a ratchet wheel I04, a spring I05 serving to keep the pawl constantly engaged with the ratchet wheel. A detent I01, also spring actuated, prevents reverse rotation of the ratchet wheel. Means are provided, however, for releasing one or both of the pawl and detent. A small lever I08, shown in the lower right-hand portion of Fig. 14, actuates crank I09 toswing the member H (Figs. 14 and 18) to raise both cam and detent, which permits the manual rota tion of the ratchet wheel I04 by means of the knob- III geared to the ratchet shaft through a pinion H2 and thence to a dial or index plate H3 which shows the setting of the ratchet wheel,

and hence, as will be shown, of the reproducing apertures. Fig. 19 shows the structure which keeps the detent release normally outoi action.

.Back lashis taken out of the ratchet'shaft by means of a clock spring IIE mounted on a drum II-at the rear end of the shaft. Geared to a pinion II! on this same shaft through a train, best shown in Fig. 16, and comprising gears III, H8 and I20 is a rack In which is .fixeclto a vertically slidable rod "I23. This rod is the third of a series of ten (the others of the series being designated by the reference character I24) which are mounted in transverse alinement across the reproducer head and whose function is to adjust the position of thelreproducing slots with relation to each otherand to the film. It will be seen that the motions which have thus far been described will cause the rack I2I to advance by a fixed increment.- at the end of each cycle of operation of the drum. The increment may be adjusted as has already been stated by turning the knurled head 80. on the reproducer head hinge. rods is connected to a single one of the apertures .and advances or retracts it proportionally to its position in the series, as will next be described.

The individual apertures I are formed in a- V series of mutually slidable plates I32, these apertures being wedge shaped, and each of the mutually slidable plates being divided into two parts,

held together by a thin sheet junction plate I33 as indicated at the left center of .Fig. 14. Fig. 12 shows the rear view of this assembly with the apertures in alihement, together with two fixed apertures I34 and I35 which are mounted on each side of the mutually slidable ones. .The slidable aperture plates I32 are connected through ofiset arms I31 with individual sliding shafts I35. Each of these shafts carries a block I35 into which is threaded a screw collar I which is fixed to one of the individual shafts I23 or I24. The lower end of each of the shafts I38 carries a compression spring I42 to take up back lash. The shafts I23 and I24 are each 'splined to a pinion I43 which is driven through a meshing gear 'I44- .by a knurled thumb piece dex wheel-443; It will therefore: be seen that by rotating .thethumb piece I45 the. relative posh.

Each of these vertical amass?" tion of the aperture I30 can 'be changed with thus made being individual and permanent until reset, and the amount of the change being clearly indicated by the indices I43. At the same time the shafts I23 and I26 may be slid vertically without changing this individual setting. Each of these shafts carries a pin I which engages a groove'or channel in a rocker arm I52. This rocker arm is pivoted at its center. and therefore the movement imparted to the vertical shaft I23, as already described, is translated into a proportional motion of each of the other shafts 124. 'IThis causes the recording apertures I30 to advance in an echelon formation at the end of each cycle of operation of the drum.

Except for the individual weathering corrections as set by the thumb pieces I45, which corrections are usually small, the aperture centers remain on a straight line. When the analysis of a record is started this line extends diagonally downward from left to right when viewed from the aspect of Fig. 12. When half of the traces of an analysis have been made the apertures will be alined nor mally to the motion of the film, in the position shown in Fig. 12, and when the retracings are completed the apertures will be again-diagonally disposed, but now downward from rightto left. The pawl and detent are then released and the apertures are reset by means of the knob II I to -brace but a single reproducing slit or aperture and is primarily used when making a record from one of the fixed apertures I34 or I35, which register with the track made by the timing trace and the record of the explosion time. The second aperture set I58 comprises five vertical slits so spaced as to engage every alternate one of the reproducing slits, while the third aperture arrangement I53 embraces all ten of these slits. The gate is movable-so that any one of the three sets of apertures may be used and so that the second set of apertures I58 may be used to select either the odd or even numbered reproducer slits. This arrangement is convenient because it is frequently desirable to record the wave, received by two sets of geophones on the same film as, for example, whenone set of five geophones is arranged on a base linewhich is alined with theposition on the earth's surface of the original impulse or explosion, while the second set of five geophones is positioned on a base line normal to the first. It will be understood that there are also occasions when the entire set of geophones are alined along-the same-base line in which case the aperture I50 would be used.

Immediately in front of the reproducing aper- 1 tures is an optical system comprising a lens I50, a right angle totally reflecting prism I52 and a second lens I53 which serve to focus the light passing through the film and the reproducing aperturesupon the photo cell I54. This photocell is connected through conventional circuits with. an amplifier I55 and an adjustable frequency filter which is housed in the casing I68 shown at the left of Fig. 1.

- The output from the amplifier is fed into the recording galvanometer mounted in a movable head no. The pen or other reproducing point ill of this galvanometer bears upon the drum surface, and, since the light from all of the reproducing apertures is combined in the same photocell, the output current of the amplifier will be proportional to the algebraic sum of the components of each of the sound tracks on the film in a time phase which is determined by the relative positions of the reproducing apertures I38.

Means are provided for advancing the galva nometer housing I'll! parallel to the axis of the recording drum and along a set of ways I15, suchmotion occurring at the end of eachrevolution or cycle oi the drum. Various methods of accomplishing this are obviously possible. I prefer. however, to use a separate motor I" mounted above the amplifier I65 in which a reduction gear I78 drivesa set of bevel gears I19 and thence a lead screw I80 which extends between the ways I15. A split lead nut 882 is held in engagement with the lead screw by spring I83.

A hand wheel I8! is provided for making the initial setting of the pen carriage and for any minor adjustments that may be necessary in the course'of a wave analysis. Normally, however, the entire motion of the pen carriage during such an analysis is accomplished by the motor I". A cam I85 is provided on the periphery of the drum for actuating a momentary contact mercury switch I37 which starts the motor and closes a relay I88 which keeps it in operation until the lead screw I80 has made a single turn, which opens the circuit again, by means of the cam-operated contractor I89, until the drum cam again operates. It is also convenient to provide an interlock between the pen carriage and the pin clutch l2 which opens the clutch and causes the device to shut off automatically when the final tracing has been made.

This is accomplished as shown in Fig. 24. At the end of the pen-carriage travel the lug I90 on the carriage strikes a lever I92. A fork on the lower end of this lever engages a crankpin I93 carried by a rocker shaft I95, a yoke l9! on the other end of this shaft actuating the clutch.

It will be seen that the device here described and claimed will, when once started in operation, execute as many traces as may be required for a complete analysis of a wave record. It

for driving a trace record, means for" driving a phonographic record in fixed space relation to the movement of said trace record, means for simultaneously reproducing a plurality of sound tracks from said phonographic record into a common sound channel, a recording point connected to be driven from said sound channel and positioned to form a trace on said trace record, and means for altering the relative time phase relationship vof-the points on the various sound tracks fro which reproduction occurs.

a we e resold analyzer c p g means for driving .a trace record, means for driving a phonographic record in fixed space relation to the movement of said trace record, means for simultaneously reproducing a plurality of sound tracks irom said phonographic record into a common sound channel, a recording point connected to be driven from said sound channel and positioned to form a trace on said trace record, and means for making simultaneous proportional alterations in the relative time phase relationships of the points on the various sound tracks from which reproduction occurs.

3. A wave record analyzer comprising means for driving a trace record, means for driving a phonographic' record in fixed space relation to the movement of said trace record, means for simultaneously reproducing aplurality of sound tracks from said phonographic record into a common sound channel, a recording point connected to be driven from said sound channel and positioned to form a trace on said trace record, and means for making simultaneous proportional alterations in the relative time phase relationships of the points on the various sound tracks from which reproduction occurs, and additional means for making individual alterations in the relativ positions of said points.

4. A wave record analyzer comprising a rotatable drum for carrying a. trace record, means for rotating said drum, a film drive sprocketgeared to move concurrently with said drum, means for reversing the direction of rotation of said sprocket at the end of each such rotation to return a film driven by said sprocket to its initial position relative to the angular position of said drum, a plurality of reproducing apertures positioned to coact with a plurality of sound tracks recorded on said film, means coacting with said apertures for translating said sound tracks into electric currents flowing in a common channel, a recording galvanometer connected to said channel and positioned to form its record trace upon the record carried by said drum, and means for shifting the relative positions of said apertures -along said sound tracks upon completion of each revolution of the drum.

5. A wave record analyzer comprising a rotat-- able drum for carrying a trace record, means for rotating said drum, a film drive sprocket geared to move concurrently with' said drum, means for reversing the direction of rotation of said sprocket at the end of each such rotation to return a film driven by said sprocket to its initial position relative to the angular position of said drum, a plurality of reproducing apertures positioned to coact with a plurality of sound tracks recorded on said film, means coacting with said apertures for translating said sound tracks into electric currents flowing in a common channel, a recording galvanometer connected to said channel and positioned to fprm its record trace upon the record carried by said drum and means for shifting the relative positions of said apertures along said sound tracks by a predetermined proportional increment upon completion of each revolution of the drum.

6. A wave record analyzer comprising a rotatable, drum for carrying a trace record, means for rotating said drum, 9. film drive sprocket geared sltioned to coact with a plurality oi sound tracks recorded on said film, means coacting with said apertures for translating said sound tracks into electric currents flowing in a com= mon channel, a recording galvanometer connected to said channel and positioned to form its record trace upon the record carried by said drum and means for shifting the relative positions of said apertures along said sound tracks by a predetermined proportional increment upon completion of each revolution of the drum, and additionai means for individually adjusting the relative positions of said apertures.

'7. A wave record analyzer comprising a rotatable drum for carrying a trace record, means for rotating said drum, afilm drive sprocket geared to move concurrently with said drum, means for reversing the direction of rotation of said sprocket at the end of each such rotation to return a film driven by said sprocket to its initial position relative to the angular position of said drum, a plurality of reproducing apertures positioned to coact with a plurality of sound tracks recorded on said film, means coacting with said apertures for translating said, sound tracks into electric currents flowing in a common channel, a recording galvanometer connected to said channel and positioned to form its record trace upon the record carried by said drum and means for shifting the relative positions of said apertures along said sound tracks upon completion of each revolution of the drum, and a movable gate interposed in line with said film and apertures for occulting certain thereof 8. A wave record analyzer comprising a rotatable drum for carrying a trace record, means for rotating said drum, a film drive sprocket geared to move concurrently with said drum, means for reversing the direction of rotation-of said sprocket at the end of each such rotation to return a film driven by said sprocket to its initial position relative to the angular position of said drum, a plurality of mutually slidable plates mounted parallel to the motion said film and each provided with a reproducing aperture positioned to coact with a sound track recorded thereon, a rocker arm, means for tilting said rocker arm by a predetermined increment at the end of each rotation of 50 said drum, 2. connection. between each of said plates and a different point on said rocker arm for sliding said plates proportionally and means for recording at the surface of said drum the sum of the densities of said sound tracks.

9. A wave record analyzer comprising a rotatable drum for carrying a trace record, means for rotating said drum, a film drive sprocket geared to move concurrently with said drum, means for reversing the direction of rotation of said sprocket at. the end of each such rotation to return a film driven by said sprocket to its initial position relative to the angular position of said drum, a plurality of mutually slidable plates mounted parallel to the motion said film and each provided with a reproducing aperature positioned to coact with a sound track recorded thereon, a rocker arm, means for tilting said rocker arm by a predetermined increment at the end of each rotation of said drum, a connection between each of said plates and a different point on said rocker arm for sliding said plates proportionally, and an adjusting means interposed in each of said connections'for sliding said plates individually irrespective of their proportional movement, and means for recording at the surface of said drum the sum of the densities of said sound tracks.

I 10. A wave record analyzer comprising a rotatable drum for carrying a trace record, means for rotating said drum, a film drive sprocket geared to move concurrently with said drum, means for reversing the direction of rotation of said sprocket at the end of each such rotation to return a film driven by said sprocket to its initial position relative to the angular position of said drum, a hinge pin mounted adjacent said sprocket drive, a slidable collar mounted on said hinge pin, a reproducing head hinged on said pin and including a plurality of mutually slidable reproducing apertures, means actuated by said sprocket drive gearing for sliding said collar on said hinge pin at each revolution of said drum, means within said reproducing head and actuated by movement of said collar for changing the relative positions of said apertures by predetermined proportional increments, and means including said apertures for recording at the surface of said drum the sum of the densities of a plurality of sound tracks recorded on a film driven by said sprocket.

FRANKRIEBER. 5o 

